9 I wrote unto you in an epistle not to company with fornicators:
9
I wrote to you in my letter not to associate with sexually immoral people—
10 Yet not altogether with the fornicators of this world, or with the covetous, or extortioners, or with idolaters; for then must ye needs go out of the world.
10
not at all meaning the people of this world who are immoral, or the greedy and swindlers, or idolaters. In that case you would have to leave this world.